You can only borrow from the next period that you own to use in the current period that you own.
If you own year 1, you would borrow from year 3 and you could only use the borrowed StarOptions in year 1. Same for years two and four. You can't use borrowing to go in a period where you don't own - if you own even years, you can't borrow to go during an odd year.
If you are Elite, you can borrow every time you are eligible to go. If you are not Elite, you can only borrow every other time that you use your interval.
If you owned separate even and odd years and you wanted to borrow in an even year, you'd be borrowing from the even interval two years in the future, not from the odd years that you own.
You always borrow from the next period that you own - the next even year for even ownership, the next odd year for odd ownership and the next year for every year ownership.
To the OP, there is no way to buy an EOY lock-off to use EY within SVN. At best you could deposit your week with II and exchange into it the following year (if it is not one of the hard-to-get-into locations), or rent it out and use the proceeds to rent something yourself the following year. A direct exchange with someone who owns the opposite years could also work.